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10 (ten) is the natural number following nine and preceding eleven.
| 10 | |
|---|---|
| Cardinal | ten |
| Ordinal | tenth |
| Numeral system | decimal |
| Factorization | 2*5 |
| Roman numeral | X |
| Binary | 1010 |
| Hexadecimal | A or X |
Mathematics
Ten is a composite number, its proper divisors being 1, 2 and 5.
Ten is the base of the decimal numeral system, by far the most common system of denoting numbers both in spoken and written language. For this reason, any number can be instantly multiplied by ten by adding a zero to the end (855 * 10 = 8,550). The basis for choice of ten is presumably that ten is the number of fingers (digits) of the human body.
The Roman numeral for ten is X (which looks like two V's [the Roman numeral for 5] put together).
The Chinese word numeral for ten is 十, which resembles a cross.
Ten is the sum of the first three prime numbers.
A collection of ten items (most often ten years) is called a decade.
A polygon with ten sides is a decagon.
| Base | Numeral system | |
|---|---|---|
| 2 | binary | 1010 |
| 3 | ternary | 101 |
| 4 | quaternary | 22 |
| 5 | quinary | 20 |
| 6 | senary | 14 |
| 7 | septenary | 13 |
| 8 | octal | 12 |
| 9 | novenary | 11 |
| 10 | decimal | 10 |
| over 10 (hexadecimal) | A or X | |
Other fields
A decapod crustacean has ten limbs.
There are ten cents in a dime, itself one tenth of a dollar. The word was shortened from decime.
People were traditionally tithed one tenth of their produce.
It takes ten to make a minyan.
With ten being the base of the decimal system, a scale of 1 to 10 is often used to rank things, as a smaller version of a 1-to-100 scale (as is used in percentages).
Blake Edwards' 1979 movie 10.
Something that scores perfectly is "a perfect ten". A person who is extremely attractive and physically flawless is often said to be "a ten", from the idea of ranking that person's appearance and sex appeal on a 1-to-10 scale. E.g. In the movie 10 Bo Derek is supposedly a "10" on that scale.
Counting from one to ten before speaking is often done in order to cool one's temper.
Driving a racing car at ten-tenths is driving as fast as possible, on the limit.
Ten is:
9 and 11